How many times should my screen flash white after a restart?

Every time I do a Restart on my 17" MacBook Pro, the screen goes black, then flashes white for a few seconds, and repeats over the next 2 - 3 minutes approx. 4 more times. I am used to seeing this process only once on my previous MacBook Pro's. Is this a common sequence?

Every time I do a Restart on my 17" MacBook Pro, the screen goes black, then flashes white for a few seconds, and repeats over the next 2 - 3 minutes approx. 4 more times. I am used to seeing this process only once on my previous MacBook Pro's. Is this a common sequence?

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